• Proceedings of the Materials Research Society of Korea Conference
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• 1998.08a
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• pp.149.2-149
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• 1998

• Proceedings of the Materials Research Society of Korea Conference
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• 1998.08a
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• pp.55.2-55
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• 1998

• Proceedings of the Materials Research Society of Korea Conference
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• 1998.08a
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• pp.55.1-55
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• 1998

• Polymer Science and Technology
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• v.8 no.3
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• pp.326-336
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• 1997

• Proceedings of the KIEE Conference
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• 1987.07b
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• pp.978-980
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• 1987

This paper presents a scheme of $16{\times}16$ VLSI crosspoint chip as a key Component in future broadband switching network operating at bit rates UP to 140Mbit/s using space division switching technique. First, functional requirements of the chip are investigated in terms of a large switching unit. Then, a regeneration circuit to provide reshaping of previsiously switched signals is presented.

• Journal of the Korean Institute of Telematics and Electronics D
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• v.34D no.5
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• pp.52-60
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• 1997

Photonic switching systems with throughput above Tbit/s are reuried to transport vast amounts of information for the coming B-ISDN. In this paper, we proposed a new time-division hybrid WDM photonic swithc architecture, the proposed basic switch module has simple configuratin consisted of frequency routers for wavelength division and cell coders and star couplers for time division. Through the comparison with other sysems in field of switching capacity, hardware complexity and cost effect of implemetnation, we proved that the proposed system is suitable for large-capacity photonic switching system.

• Journal of Communications and Networks
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• v.1 no.3
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• pp.145-152
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• 1999

A new switch architecture is presented to enhance out-put queuing in photonic packet switches. Its appkication is for a packet switching enviroment based on the optical transport of fixed length packets. This architecture consists of a couple of cas-cading switching elements with output queuing, whose buffer ca-pacity is limited by photonic technology. The introduction of a suitable buffer management allows a very good and balanced ex-ploitation of the available optical memories, realized with fiber de-lay lines. In particular, packet loss performance is here evaluated showing the improvement with respect to the single switch and a way to design large optical switches is shown in order to meet broadband network requirements.

• Proceedings of the Materials Research Society of Korea Conference
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• 1998.08a
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• pp.152.2-152
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• 1998

• Journal of the Korean Institute of Telematics and Electronics A
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• v.32A no.5
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• pp.60-70
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• 1995

As a Basic study to implement a wide-band photonic switching sysetm, we proposed a scheme of free-space-division-multiplexed photonic switching based on a holographic interconnectio method and carried out simple experiments on it. First, we recorded holgraphic interconnection element array for nonblocking optical interconnections. Just a single stage of the array realizes full optical interconnections between NN${\times}$NN input prots and NN${\times}$NN output ports in 3-D space. Next, in reading of the array for optical internnections, we showed that the zeroth-order diffacted beam could be eliminated in the output port by introducing a right angle prism. The elimination of the zeroth-order diffracted beam reduces optical noise in the output ports and provides conveniences of interconnection control in our scheme. Finally, from the experiments on ON-OFF switching of the optical interconnection paths one by one using a spatial (display of the liquid crystal telecision), we showed the feasibility of photonic wsitching based on the holographic interconnection method. We also estimated approximately the maximum interconnectio scale that can be realized without difficulty with current optical devices.

• Journal of KIISE:Information Networking
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• v.28 no.4
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• pp.657-664
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• 2001

In our predecessor paper(Part I)[13], we introduced a graph that represents the crosstalk relationship among multicast connections in the photonic Banyan-type switching network, and found the upper bound on the degree of it. In this paper(Part II), we consider the number of routing rounds(i.e., scheduling length) required for SE(switching element)-disjoint multicasting in photonic Banyan-type switching networks. Unfortunately, the problem to find an optimal scheduling length is NP-complete thus, we propose an approximation algorithm that gives its scheduling length is always within double of the upper bound on the optimal length. We also study the scheduling length on the Iink-disjoint(i.e., nonblocking) multicasting. Various nonblocking Banyan-type multicasting networks are found under the scheduling lengths.